On Chrome 83.0.4103.97 , I tested on a Cloud 11.10.5 and 10.11.9 to copy with CTRL+C the elements from an existing diagram page and to paste them with CTRL+V on a different diagram page.
Selecting elements from a diagram, then pressing CTRL+C:
The expected result would be to obtain the copied elements without duplication.
Actual result after pressing CTRL+V shows duplicated elements:
I had to use CTRL+Z to obtain only one group of the elements.
On Chrome 83.0.4103.97 , I tested on a Cloud 11.10.5 and 10.11.9 to copy with CTRL+C the elements from an existing diagram page and to paste them with CTRL+V on a different diagram page.
Selecting elements from a diagram, then pressing CTRL+C:![image](https://user-images.githubusercontent.com/36840106/84519191-6379dc00-acda-11ea-854c-27b008940ef5.png)
The expected result would be to obtain the copied elements without duplication.
Actual result after pressing CTRL+V shows duplicated elements:![image](https://user-images.githubusercontent.com/36840106/84519326-98862e80-acda-11ea-8769-f4cf7779af10.png)
I had to use CTRL+Z to obtain only one group of the elements.